Finding the Fourth Proportional to 30,714.53, 42,399.14 and 20,648.81

Step by Step Solution

1. Step 1: Write the proportion equation
   30,714.53 : 42,399.14 = 20,648.81 : x
2. Step 2: Convert to fraction form
   30,714.53/42,399.14 = 20,648.81/x
3. Step 3: Cross multiply
   30,714.53x = 42,399.14 × 20,648.81
4. Step 4: Simplify right side
   30,714.53x = 875,491,788.78
5. Step 5: Solve for x
   x = 875,491,788.78/30,714.53
6. Step 6: Final answer
   x = 28,504.15